How can I get my LTR to wear the women's test pack without telling her?

Hello all you pherotalkers, i would like to see the effects of women wearing pheromones on myself, so i bought the new, womens test pack. What i want to do is somehow get my ltr to wear one of them without her knowledge of its contents (i.e. pheromones). Can anyone think of a way to either give it to her or something like that? I would have to put it into a different container or peel the sticker off, right? Any input at all would be appreciated. Thank you in advance!

Maybe just tell her that you got some perfume and ask her if she want to wear a little to try?